Updated

Chris Epperson shot a 9-under 63 on Friday on PGA West's Nicklaus Tournament Course to take a four-stroke lead after the second round of the Web.com Tour Qualifying Tournament.

The 31-year-old Epperson, from Hilton Head Island, S.C., had a 16-under 128 total.

The players are competing for positions in the Web.com Tour's priority ranking used to form tournament fields, with the medalist (or co-medalists) guaranteed fully exempt status. Every player who is at PGA West is guaranteed a spot on the Web.com Tour next season. The six-round tournament will end Tuesday.

Steve Saunders and Nathan Tyler were tied for second. Saunders had a 65, and Tyler shot 66 — both on the Nicklaus course. First-round leader Justin Shin of Canada followed his opening 64 on the Nicklaus course with a 74 on the Stadium layout to drop into a tie for 25th at 6 under.